WO2016151731A1

WO2016151731A1 - Mobile object receiver

Info

Publication number: WO2016151731A1
Application number: PCT/JP2015/058746
Authority: WO
Inventors: 佐々木　保
Original assignee: 三菱電機株式会社
Priority date: 2015-03-23
Filing date: 2015-03-23
Publication date: 2016-09-29

Abstract

A mobile object receiver (1) determines, as a station to be selected, a broadcast station, a radio wave from which has a receivable electric field strength level and is assessed to be a broadcast wave with sound.

Description

Mobile receiver

The present invention relates to a mobile receiver that is mounted on an automobile or the like and receives broadcast waves.

2. Description of the Related Art Conventionally, an auto-preset function is known that searches for broadcast stations that can be received from a preset frequency band and registers them in a preset list in a mobile receiver.
By referring to this preset list, it is possible to select a broadcast station even when the reception environment changes due to movement of a mobile object.
Note that the determination of a receivable broadcasting station is generally based on the electric field strength of the received radio wave.
For example, in the conventional receiver described in Patent Document 1, when the S level indicating the electric field strength of a broadcast wave is equal to or higher than an allowable level, it is determined as a receivable broadcast station and determined as a channel selection target.

JP-A-8-298441

On the other hand, there are broadcasting stations that stop broadcasting programs and send only radio waves whose radio sound is not modulated due to inspection, maintenance, or suspension of broadcasting facilities.
In the conventional receiver described in Patent Document 1, even such a broadcasting station is determined as a channel selection target if it can be received based on the electric field strength of the received radio wave.
For this reason, when the above-mentioned broadcasting station is mistakenly registered in the preset list as a channel selection target, there is a problem in that radio sound is not output even if this broadcasting station is selected from the preset list.

The present invention solves the above-described problems, and an object of the present invention is to provide a mobile receiver capable of reliably excluding broadcast stations that transmit radio waves from which no sound is output from the selection target.

The mobile receiver according to the present invention includes a first determination unit, a second determination unit, and a control unit.
The first determination unit determines whether or not the electric field intensity level of the radio wave received by the reception unit is a receivable level. The second determination unit determines whether the radio wave received by the reception unit is a broadcast wave with sound. The control unit determines, as a channel selection target, a broadcast station that transmits a radio wave that is determined to be a receivable level by the first determination unit and that is determined to be a broadcast wave with sound by the second determination unit.

According to the present invention, there is an effect that it is possible to surely exclude broadcast stations that transmit radio waves from which no sound is output, from being selected.

It is a block diagram which shows the structure of the receiver for mobile bodies which concerns on Embodiment 1 of this invention. It is a block diagram which shows the internal structure of the microcomputer of FIG. 3 is a flowchart illustrating the operation of the microcomputer according to the first embodiment. 6 is a block diagram illustrating an internal configuration of a microcomputer according to Embodiment 2. FIG. 10 is a flowchart illustrating the operation of the microcomputer according to the second embodiment. It is a block diagram which shows the structure of the receiver for mobile bodies which concerns on Embodiment 3 of this invention. It is a block diagram which shows the internal structure of the microcomputer of FIG. 10 is a flowchart illustrating the operation of the microcomputer according to the third embodiment.

Hereinafter, in order to describe the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a mobile receiver 1 according to Embodiment 1 of the present invention. The mobile receiver 1 is a receiver that is mounted on an automobile or the like and receives a broadcast wave from a broadcast station, and is embodied as a radio receiver for a vehicle, for example.
Hereinafter, a case where the mobile receiver 1 is a vehicle radio receiver will be described as an example. That is, the mobile receiver 1 outputs the broadcast program received by the radio antenna 2 through the speaker 6.

The mobile receiver 1 includes a tuner unit 3, a digital signal processing circuit (hereinafter referred to as a DSP) 4, and a microcomputer (hereinafter referred to as a microcomputer) 5 as internal components. The tuner unit 3 embodies the receiving unit in the present invention, and receives a radio broadcast via the radio antenna 2. Radio broadcasting can receive both FM (frequency modulation) broadcasting and AM (amplitude modulation) broadcasting.

The tuner unit 3 selects a signal having a preset reception frequency from a high-frequency signal (hereinafter referred to as an RF signal) received by the radio antenna 2 and adjusts the gain thereof, and then adjusts the intermediate frequency signal (hereinafter, referred to as an RF signal). Frequency conversion to IF signal). Further, the tuner unit 3 performs DC detection on the IF signal, extracts the S level indicating the received electric field strength, and outputs the S level together with the IF signal to the DSP 4.

The DSP 4 performs various signal processing such as digital filtering, audio decoding, and data decoding on the IF signal input from the tuner unit 3.
For example, the DSP 4 performs audio decoding on the IF signal and extracts an audio signal. The audio signal is converted into an analog signal and then output through the speaker 6.
However, the DSP 4 extracts the audio signal in the same manner as described above when performing the auto preset, but outputs the amplitude level of the audio signal to the microcomputer 5 together with the S level without outputting the audio from the speaker 6.

The microcomputer 5 is a microcomputer that controls the internal configuration of the mobile receiver 1. For example, a channel received by the tuner unit 3 is determined based on a channel setting control signal input by the user, and a reception frequency matching this channel is set in the tuner unit 3. Further, the reception state of the broadcast wave is determined based on the signal from the DSP 4.

FIG. 2 is a block diagram showing an internal configuration of the microcomputer 5 shown in FIG. The microcomputer 5 shown in FIG. 2 includes a processor 50a and a memory 50b. The processor 50a includes a processing circuit such as a CPU (Central Processing Unit) and a system LSI (Large Scale Integrated circuit).
The frequency setting unit 51, the S level determination unit 52, the amplitude level determination unit 53, and the control unit 54 shown in FIG. 2 execute the program stored in the memory 50b by the processing circuit constituting the processor 50a. Realized.
A plurality of processing circuits may cooperate to execute the functions of the frequency setting unit 51, the S level determination unit 52, the amplitude level determination unit 53, and the control unit 54.

The frequency setting unit 51 is a component that sets the reception frequency designated by the control unit 54 in the tuner unit 3.
The S level determination unit 52 is a component that embodies the first determination unit in the present invention, and determines whether or not the electric field intensity level of the radio wave received by the tuner unit 3 is a receivable level. For example, the determination is made based on whether or not the S level input from the DSP 4 is equal to or higher than a preset allowable lower limit level.

The amplitude level determination unit 53 is a component that embodies the second determination unit in the present invention, and determines whether the radio wave received by the tuner unit 3 is a broadcast wave with sound.
For example, the determination is performed based on whether or not the amplitude level of the audio signal input from the DSP 4 is a silence level. The silence level is an amplitude level at which the volume level of the audio signal can be regarded as zero.

The control unit 54 controls the frequency setting unit 51, the S level determination unit 52, and the amplitude level determination unit 53. For example, the control unit 54 determines a channel to be received by the tuner unit 3 based on a channel setting control signal input from the user and designates it to the frequency setting unit 51.
In addition, the control unit 54 transmits a radio wave that is determined to be a receivable level by the S level determination unit 52 and is determined to be a broadcast wave with sound by the amplitude level determination unit 53 during auto-preset. Is determined as a channel selection target.
The preset list 55 is stored in, for example, the memory 50b, and broadcast stations determined as channel selection targets by the control unit 54 at the time of auto-preset are registered.

Next, the operation will be described.
FIG. 3 is a flowchart showing the operation of the microcomputer 5 in the first embodiment, and shows the operation in auto-preset. As described above, the auto preset is a function for automatically searching for a broadcast station capable of receiving a broadcast wave in a preset frequency band and registering it in the preset list 55.

First, the frequency setting unit 51 sets the lower limit frequency designated by the control unit 54 as a reception frequency in the tuner unit 3 (step ST1). Auto preset is performed by scanning from a lower limit frequency to an upper limit frequency in a preset frequency band.
In Japanese FM broadcasting, the lower limit frequency is 76.0 MHz and the upper limit frequency is 90.0 MHz.

The frequency setting unit 51 sets the reception frequency designated by the control unit 54 in the tuner unit 3. The tuner unit 3 selects a signal having a reception frequency from the RF signal received by the radio antenna 2, adjusts its gain, and converts the frequency into an IF signal.
Next, the tuner unit 3 performs DC detection on the IF signal, extracts an S level indicating the received electric field strength, and outputs the S level together with the IF signal to the DSP 4.
The DSP 4 extracts an audio signal by performing audio decoding on the IF signal input from the tuner unit 3 and outputs the amplitude level of the audio signal to the microcomputer 5 together with the S level.

The S level determination unit 52 determines whether or not the S level input from the DSP 4 is equal to or higher than the allowable lower limit level (step ST2). The allowable lower limit level is a level indicating the lower limit of the reception electric field strength of a broadcast wave that can be normally received, and is preset in the S level determination unit 52.
When it is determined that the S level is equal to or higher than the allowable lower limit level (step ST2; YES), the amplitude level determination unit 53 determines whether the amplitude level of the audio signal input from the DSP 4 is a silence level ( Step ST3).

Here, when it is determined that the amplitude level of the audio signal is a silence level (step ST3; YES), the amplitude level determination unit 53 checks whether or not a specified time has elapsed since the determination of step ST3. (Step ST4).
If the specified time has not elapsed (step ST4; NO), the process returns to step ST3 and the above-described processing is repeated.

The specified time is a time for specifying that the amplitude level of the audio signal is a silent level continuously, and corresponds to the determination time-out time in step ST3.
That is, if the amplitude level of the audio signal is a silence level even after the specified time has elapsed, it is determined that the audio is not modulated with the radio wave having the frequency at this time.
For example, a time of about 5 seconds is set as the specified time.
In addition, since the broadcast station that transmits the silent radio wave is determined in this determination, the above-mentioned specified time may be shortened in the next auto-preset. For example, shortening to about 2 seconds is conceivable.

When the amplitude level determination unit 53 determines that the amplitude level of the audio signal is not a silence level (step ST3; NO), the control unit 54 determines a broadcast station that transmits radio waves of this frequency as the channel selection target. Then, it is registered in the preset list 55 (step ST5).
In this way, broadcast stations that transmit radio waves that are determined to be receivable levels and have broadcast sound are registered in the preset list 55.

When the S level is less than the allowable lower limit level (step ST2; NO), when the processing of step ST5 is completed, or when the specified level has passed and there is no sound level (step ST4; YES), the control unit 54 The reception frequency is switched (step ST6).
For example, a frequency obtained by adding a preset frequency XHz to the previous reception frequency is determined as the frequency to be received next time and set in the frequency setting unit 51.

Thereafter, the control unit 54 confirms whether or not the above-described series of processing has been performed until the upper limit frequency is reached (step ST7). If the upper limit frequency is not reached (step ST7; NO), the process from step ST2 is repeated for the radio wave having the newly set frequency. On the other hand, when the upper limit frequency is reached (step ST7; YES), the auto preset is terminated.

As a first factor in which sound cannot be heard even when a broadcast station is selected, a case where broadcast waves cannot be received is considered. Further, as described above, as a second factor, no sound is output even when the received radio wave is an unmodulated carrier wave. In any case, when the received signal is processed as an audio signal, the amplitude level of the audio signal becomes a value close to zero.
However, although the first factor can be specified from the S level of the received signal, it is necessary to obtain the amplitude level of the audio signal from the received signal in order to specify the second factor. Even processing takes time.
Therefore, in the case of FIG. 3, first, it is checked whether or not the broadcast wave can be received to check whether or not the broadcast station corresponds to the first factor. And it is confirmed whether it is a broadcasting station applicable to a 2nd factor from the broadcasting stations which do not correspond to a 1st factor.
By doing so, it is possible to efficiently determine a broadcasting station without sound, and to shorten the processing time.

In the above description, the mobile receiver 1 is a vehicle radio receiver that receives radio broadcasts, but the present invention is not limited to this.
The present invention may be a television receiver. For example, when a silent broadcast radio wave is transmitted from a TV broadcast station for the reason of the end of the broadcast time, such a broadcast station is determined as a channel selection target by performing the same processing as described above. Can be prevented.

Further, in the present invention, it is silently included that there is no substantially meaningful sound output.
For example, when the television broadcast time ends, an oscillation sound (pee sound) may be output together with a color bar or the like. This oscillating sound is not a sound of the program content but a sound having a predetermined frequency and a constant amplitude level.
Therefore, by setting a threshold value for specifying the oscillation sound, it is possible to prevent a broadcast station whose broadcasting time has ended from being registered as a channel selection target.

In addition, although the case where the S level was determined in step ST2 and then the amplitude level of the audio signal was determined in step ST3, the order of these processes may be reversed.
That is, the amplitude level of the audio signal may be determined first, and the S level of the received signal may be determined when it is determined that the broadcast wave has sound. Even if processing is performed in this manner, the same effects as described above can be obtained. However, when the amplitude level of the audio signal is determined first, it is necessary to obtain the amplitude level of the audio signal even for a broadcasting station that cannot receive the broadcast wave, and the processing may take a long time.

As described above, the mobile receiver 1 according to Embodiment 1 includes the S level determination unit 52, the amplitude level determination unit 53, and the control unit 54. The S level determination unit 52 determines whether or not the electric field intensity level of the received radio wave is a receivable level. The amplitude level determination unit 53 determines whether the received radio wave is a broadcast wave with sound. The control unit 54 determines, as a channel selection target, a radio wave station that is determined to be a receivable level by the S level determination unit 52 and is determined to be a broadcast wave with sound by the amplitude level determination unit 53.
By configuring in this way, it is possible to reliably exclude broadcast stations that transmit radio waves from which no sound is output from the selection target.

Further, the amplitude level determination unit 53 in the first embodiment determines whether or not the broadcast wave has sound based on whether or not the amplitude level of the sound signal extracted from the received radio wave is a silence level. . In this way, it is possible to easily determine the presence or absence of sound using the amplitude level of the sound signal obtained by the digital signal processing of the DSP 4.
Although the presence / absence of sound in the received radio wave is determined based on the amplitude level of the sound signal, the presence / absence of sound can be determined by other methods.

Furthermore, the control unit 54 according to the first embodiment presets the broadcast stations of radio waves that have been determined to be a receivable level by the S level determination unit 52 and have been determined to be broadcast waves with sound by the amplitude level determination unit 53. Register at 55.
In this way, it is possible to prevent a broadcast station that transmits radio waves without a broadcast program from being registered in the preset list 55.

Embodiment 2. FIG.
FIG. 4 is a block diagram showing the internal configuration of the microcomputer 5A in the second embodiment. A microcomputer 5A shown in FIG. 4 includes a processor 50a and a memory 50b as in FIG. The processor 50a includes a processing circuit such as a CPU and a system LSI.
In FIG. 4, the same components as those in FIG.
The frequency setting unit 51, the S level determination unit 52, the amplitude level determination unit 53, and the control unit 54A illustrated in FIG. 4 are executed when the processing circuit included in the processor 50a executes a program stored in the memory 50b. Realized.
Further, a plurality of processing circuits may cooperate to execute the functions of the frequency setting unit 51, the S level determination unit 52, the amplitude level determination unit 53, and the control unit 54A.

The control unit 54A controls the frequency setting unit 51, the S level determination unit 52, and the amplitude level determination unit 53 as in the first embodiment.
However, when a broadcast station that transmits a radio wave that is determined to be a receivable level by the S level determination unit 52 and is determined to be a broadcast wave with sound by the amplitude level determination unit 53 is seeked by the control unit 54A, Seek to stop.

Next, the operation will be described.
FIG. 5 is a flowchart showing the operation of the microcomputer 5A in the second embodiment, and shows the operation at the seek stop. The seek stop is a function that automatically searches for a broadcast station that can receive a broadcast wave in a preset frequency band and performs reception by staying at that frequency when a receivable broadcast station is sought.

First, the frequency setting unit 51 sets the start frequency designated by the control unit 54 in the tuner unit 3 as a reception frequency (step ST1a). For example, a seek stop is performed by scanning from a start frequency to an end frequency in a preset frequency band.
The S level determination unit 52 determines whether or not the S level input from the DSP 4 is equal to or higher than the allowable lower limit level (step ST2a).
When the S level determination unit 52 determines that the S level is equal to or higher than the allowable lower limit level (step ST2a; YES), the amplitude level determination unit 53 determines whether the amplitude level of the audio signal input from the DSP 4 is a silence level. It is determined whether or not (step ST3a).

When the amplitude level determination unit 53 determines that the amplitude level of the audio signal is not a silence level (step ST3a; NO), the control unit 54A instructs the frequency setting unit 51 to remain at the current frequency, and seek stop. To do.
As a result, a broadcast station that transmits a radio wave that is determined to be a receivable level and that is a broadcast wave with sound is selected.

On the other hand, when it is determined that the amplitude level of the audio signal is a silence level (step ST3a; YES), the amplitude level determination unit 53 checks whether or not a specified time has elapsed since the determination of step ST3a ( Step ST4a). If the specified time has not elapsed (step ST4a; NO), the process returns to step ST3a and the above-described processing is repeated.
In addition, since the broadcast station that transmits the silent radio wave is determined in this determination, the above-mentioned prescribed time may be shortened at the next seek stop.

When the S level is less than the allowable lower limit level (step ST2a; NO), or when the specified level has passed the silence level (step ST4a; YES), the control unit 54A switches the reception frequency (step ST5a). . For example, a frequency obtained by adding a preset frequency XHz to the previous reception frequency is determined as the frequency to be received next time and set in the frequency setting unit 51.

Thereafter, the control unit 54A checks whether or not the series of processes described above has been performed until the end frequency is reached (step ST6a). If the end frequency has not been reached (step ST6a; NO), the process from step ST2a is repeated for the radio wave having the newly set frequency. When the end frequency is reached (step ST6a; YES), the control unit 54A determines that there is no broadcast station that can receive and transmits radio waves with sound, and ends the seek stop.

In addition, although the case where the amplitude level of the audio signal is determined in step ST3a after the S level is determined in step ST2a, the order of these processes may be reversed.
That is, the amplitude level of the audio signal may be determined first, and the S level of the received signal may be determined when it is determined that the broadcast wave has sound. Even if processing is performed in this manner, the same effects as described above can be obtained.

As described above, the control unit 54A according to the second embodiment is a radio wave broadcasting station that has been determined to be a receivable level by the S level determination unit 52 and that has been determined to be a broadcast wave with sound by the amplitude level determination unit 53. When seek is seeked, it stops seeking.
By doing in this way, it is possible to accurately perform a seek stop at a broadcasting station that is capable of receiving and transmitting a broadcast with sound.

The mobile receiver 1 according to the first embodiment is configured to perform the above-described auto-preset and perform the seek stop described in the second embodiment when a seek stop is designated by the user. May be. Thereby, both effects shown in the first embodiment and the second embodiment can be obtained.

Embodiment 3 FIG.
FIG. 6 is a block diagram showing a configuration of a mobile receiver 1A according to Embodiment 3 of the present invention. The mobile receiver 1A is a receiver that is mounted on an automobile or the like and receives broadcast waves from a broadcast station, as in

Embodiments

1 and 2, and is embodied as a radio receiver for a vehicle, for example. . Hereinafter, the case where the mobile receiver 1A is a vehicle radio receiver will be described as an example. That is, the mobile receiver 1 </ b> A outputs the broadcast received by one of the

radio antennas

2 a and 2 b from the speaker 6.

The mobile receiver 1A includes a main tuner unit 3a, a sub-tuner unit 3b, a DSP 4, and a microcomputer 5B as an internal configuration. In FIG. 6, the same components as those of FIG.

The main tuner unit 3a embodies the receiving unit in the present invention, and receives a radio broadcast via the radio antenna 2a. Radio broadcasting can receive both FM broadcasting and AM broadcasting.

Similarly to the above, the sub tuner unit 3b embodies the receiving unit in the present invention, and receives a radio broadcast via the radio antenna 2b. Radio broadcasting can receive both FM broadcasting and AM broadcasting.
However, in the sub tuner unit 3b, the station list is generated in the background where the main tuner unit 3a is receiving the radio broadcast.
The station list is a list obtained by detecting broadcast stations that can be received from all frequency bands that can be set in the mobile receiver 1A.

The microcomputer 5B is a microcomputer that controls the internal configuration of the mobile receiver 1A. For example, a channel received by the main tuner unit 3a is determined based on a channel setting control signal input by the user, and a reception frequency matching this channel is set in the main tuner unit 3a. In addition, the station tuner 3b controls station list update processing.

FIG. 7 is a block diagram showing an internal configuration of the microcomputer 5B of FIG. A microcomputer 5B shown in FIG. 7 includes a processor 50a and a memory 50b as in FIG. The processor 50a includes a processing circuit such as a CPU and a system LSI.
In FIG. 7, the same components as those in FIG.
The frequency setting unit 51, the S level determination unit 52, the amplitude level determination unit 53, and the control unit 54B illustrated in FIG. 7 are configured such that the processing circuit included in the processor 50a executes a program stored in the memory 50b. Realized.
Further, a plurality of processing circuits may cooperate to execute the functions of the frequency setting unit 51, the S level determination unit 52, the amplitude level determination unit 53, and the control unit 54B.

The control unit 54B controls the frequency setting unit 51, the S level determination unit 52, and the amplitude level determination unit 53 as in the first embodiment.
However, when the control unit 54B generates the station list 56, the control unit 54B transmits a radio wave that is determined to be a receivable level by the S level determination unit 52 and is determined to be a broadcast wave with sound by the amplitude level determination unit 53. The broadcasting station to be selected is determined as the channel selection target.
The station list 56 is stored in the memory 50b, for example, and broadcast stations determined as channel selection targets by the control unit 54B are registered.

Next, the operation will be described.
FIG. 8 is a flowchart showing the operation of the microcomputer 5B in the third embodiment, and shows the operation in the generation process of the station list 56. Here, as described above, all stations that can be set in the mobile receiver 1A are searched one by one, and receivable broadcast stations are registered in the station list 56.

First, the frequency setting unit 51 sets the start frequency designated by the control unit 54B in the tuner unit 3 as a reception frequency (step ST1b).
The frequency setting unit 51 sets the reception frequency designated by the control unit 54B in the sub tuner unit 3b. The sub-tuner unit 3b selects a signal having a reception frequency from the RF signal received by the radio antenna 2b, adjusts its gain, and converts the frequency into an IF signal.
Next, the sub-tuner unit 3b extracts the S level indicating the received electric field strength by DC detection of the IF signal, and outputs it to the DSP 4 together with the IF signal.
The DSP 4 extracts an audio signal by audio decoding the IF signal input from the sub-tuner unit 3b, and outputs the amplitude level of the audio signal to the microcomputer 5B together with the S level.

The S level determination unit 52 determines whether or not the S level input from the DSP 4 is equal to or higher than the allowable lower limit level (step ST2b). Here, when it is determined that the S level is equal to or higher than the allowable lower limit level (step ST2b; YES), the amplitude level determination unit 53 determines whether or not the amplitude level of the audio signal input from the DSP 4 is a silence level. Determine (step ST3b).

When it is determined that the amplitude level of the audio signal is a silence level (step ST3b; YES), the amplitude level determination unit 53 checks whether or not a specified time has elapsed since the determination of step ST3b (step ST4b). ). If the specified time has not elapsed (step ST4b; NO), the process returns to step ST3b and the above-described processing is repeated.
If the amplitude level of the audio signal is a silent level even after the specified time has elapsed, it is determined that the audio is not modulated with the radio wave having the frequency at this time. For example, a time of about 5 seconds is set as the specified time.
In addition, since the broadcast station that transmits the silent radio wave is determined in this determination, the specified time may be shortened in the next update of the station list. For example, shortening to about 2 seconds is conceivable.

When the amplitude level determination unit 53 determines that the amplitude level of the audio signal is not a silence level (step ST3b; NO), the control unit 54B determines the broadcast station that transmits the radio wave of the frequency at this time as the channel selection target. The station list 56 is registered (step ST5b).
In this way, broadcasting stations that transmit radio waves determined to be receivable levels and broadcast waves with sound are registered in the station list 56.

When the S level is less than the allowable lower limit level (step ST2b; NO), when the process of step ST5b is completed, or when the specified level has passed and the sound level is still silent (step ST4b; YES), the control unit 54B The reception frequency is switched (step ST6b).
For example, a broadcast station having a frequency adjacent to the previously searched broadcast station is determined as a broadcast station to be received next time, and the frequency is set in the frequency setting unit 51.

Thereafter, the control unit 54B confirms whether or not the above-described series of processing has been performed in all frequency bands (step ST7b). If not implemented in the entire frequency band (step ST7b; NO), the processing from step ST2b is repeated for the radio wave of the newly set frequency. On the other hand, when it is implemented in the entire frequency band (step ST7b; YES), the process of generating or updating the station list 56 is terminated.

In addition, although the case where the amplitude level of the audio signal is determined in step ST3b after the S level is determined in step ST2b, the order of these processes may be reversed.
That is, the amplitude level of the audio signal may be determined first, and the S level of the received signal may be determined when it is determined that the broadcast wave has sound. Even if processing is performed in this manner, the same effects as described above can be obtained.

As described above, the control unit 54B according to the third embodiment transmits a radio wave that is determined to be a receivable level by the S level determination unit 52 and that is determined to be a broadcast wave with sound by the amplitude level determination unit 53. The broadcasting station is registered in the station list 56. By doing so, it is possible to prevent a broadcasting station that transmits radio waves from which no sound is output from being registered in the station list 56.

In addition, the mobile receiver 1A according to the third embodiment performs the auto-preset shown in the first embodiment, and when the seek stop is designated by the user's operation, the seek stop shown in the second embodiment You may comprise so that it may perform. Thereby, the effects shown in the first to third embodiments can be obtained.

So far, the case where the moving body is a vehicle such as an automobile has been shown, but the present invention is not limited to this. The mobile body in the present invention includes, for example, a person, a railroad, a ship, an aircraft, and the like. That is, the moving body only needs to move with the receiver according to the present invention.

In the present invention, within the scope of the invention, any combination of each embodiment, any component of each embodiment can be modified, or any component can be omitted in each embodiment. .

The mobile receiver according to the present invention is suitable for an on-vehicle radio receiver, for example, because a broadcast station that does not have a broadcast program and can transmit a silent radio wave can be reliably excluded from the channel selection target.

1, 1A mobile receiver, 2, 2a, 2b radio antenna, 3 tuner unit, 3a main tuner unit, 3b sub tuner unit, 5, 5A, 5B microcomputer, 6 speakers, 50a processor, 50b memory, 51 frequency setting Section, 52 S level determination section, 53 amplitude level determination section, 54, 54A, 54B control section, 55 preset list, 56 station list.

Claims

A first determination unit that determines whether or not the electric field intensity level of the radio wave received by the reception unit is a receivable level;
A second determination unit that determines whether the radio wave received by the reception unit is a broadcast wave with sound;
A control unit that determines, as a channel selection target, a broadcast station that transmits a radio wave that is determined to be a receivable level by the first determination unit and is determined to be a broadcast wave with sound by the second determination unit; A mobile receiver.
The second determination unit determines whether or not the broadcast wave has sound based on whether or not the amplitude level of the audio signal extracted from the radio wave received by the reception unit is a silence level. The mobile receiver according to claim 1.
The control unit registers, in the preset list, a broadcasting station that transmits a radio wave that is determined to be a receivable level by the first determination unit and is determined to be a broadcast wave with sound by the second determination unit. The mobile receiver according to claim 1.
When the broadcast station that transmits the radio wave determined by the first determination unit to be a receivable level and determined to be a broadcast wave with sound by the second determination unit is seeked, 2. The mobile receiver according to claim 1, wherein seek stop is performed.
The control unit registers, in the station list, a broadcasting station that transmits a radio wave that is determined to be a receivable level by the first determination unit and is determined to be a broadcast wave with sound by the second determination unit. The mobile receiver according to claim 1.